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Drainage gradient (DG) is a term in road design, defined as the combined slope due to road surface cross slope (CS) and longitudinal slope (hilliness). Although the term may not be used, the concept is also used in roof design and landscape architecture. If the drainage gradient is too low, rain and melt water drainage will be insufficient.
Rain clouds over a tank in Sri Lanka The tank cascade system ( Sinhala : එල්ලංගාව , romanized: ellaṅgāva ) is an ancient irrigation system spanning the island of Sri Lanka . It is a network of thousands of small irrigation tanks ( Sinhala : වැව , romanized: wewa ) draining to large reservoirs that store rainwater and ...
The irrigation works in ancient Sri Lanka were some of the most complex irrigation systems of the ancient world. The earliest examples of irrigation works in Sri Lanka date from about 430 BCE, during the reign of King Pandukabhaya , and were under continuous development for the next thousand years.
The National Water Supply and Drainage Board (commonly abbreviated as NWSDB) is the National Organization responsible for the provision of safe drinking water and facilitating the provision of sanitation to the people in Sri Lanka. The organization had its beginning as a subdepartment under the Public Works Department for water supply and drainage.
the design drain spacing (L) can be found from the equation in dependence of the drain depth (Dd) and drain radius (r). Drainage criteria One would not want the water table to be too shallow to avoid crop yield depression nor too deep to avoid drought conditions. This is a subject of drainage research.
Schematic of a simplified sewer: Smaller diameter pipes are laid at a shallower depth and at a flatter gradient than for conventional sewers. [1]Simplified sewerage, also called small-bore sewerage, is a sewer system that collects all household wastewater (blackwater and greywater) in small-diameter pipes laid at fairly flat gradients.
Yodha Ela, Anuradhapura, Sri Lanka. Extensive usage of elaborate aqueducts have been found to have been used in ancient Sri Lanka. The best example is the Yoda Ela or Jaya Ganga, an 87 kilometres (54 mi) long water canal carrying excess water between two artificial reservoirs with a gradient of 10 to 20 cm per kilometer during the fifth century ...
Sri Lanka Freedom Party: 22 March 2015 – 12 August 2020 Ministry of Irrigation and Water Resources Management Chamal Rajapaksa: Sri Lanka Podujana Peramuna: 12 August 2020 - Gotabaya Rajapaksa: Ministry of Irrigation Roshan Ranasinghe: Sri Lanka Podujana Peramuna: 23 May 2022 - Present: Gotabaya Rajapaksa: Ministry of Irrigation